add ccw.partialDims

[dehann]

towards #1206

see updated test result with proper correlation during "multi-partials":
JuliaRobotics/RoME.jl#434 (comment)

[codecov]

Codecov Report

Merging #1220 (94070a8) into master (ed37b39) will decrease coverage by 0.03%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##           master    #1220      +/-   ##
==========================================
- Coverage   74.08%   74.05%   -0.04%     
==========================================
  Files          55       55              
  Lines        4607     4613       +6     
==========================================
+ Hits         3413     3416       +3     
- Misses       1194     1197       +3     

Impacted Files	Coverage Δ
src/DispatchPackedConversions.jl	51.51% <0.00%> (ø)
src/IncrementalInference.jl	87.50% <ø> (ø)
src/FGOSUtils.jl	72.56% <60.00%> (-0.40%)	⬇️
src/ApproxConv.jl	88.88% <83.33%> (-0.84%)	⬇️
src/CalcFactor.jl	79.16% <100.00%> (ø)
src/FactorGraph.jl	71.10% <100.00%> (+0.26%)	⬆️
src/FactorGraphTypes.jl	100.00% <100.00%> (ø)
src/GraphProductOperations.jl	94.23% <100.00%> (+0.11%)	⬆️
src/JunctionTree.jl	84.61% <100.00%> (-0.03%)	⬇️
src/SerializingDistributions.jl	68.75% <0.00%> (-1.57%)	⬇️
... and 2 more

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